I cringe everytime I see those words "guru" "youtube celeb". I think anyone can pick up a camera and make a video and post it on youtube, depending on if people like it or not does not make you a celebrity. But, then again that's my opinion. And yes, I believe that sometimes people tend to forget that the person in front of that camera has feelings too.. I'm guessing that's what it is, because sometimes the comments get out of hand. I don't know what anyone would say about that lady you mentioned. She has such beautiful hair, even I wanna know what she does just so I can add it on to my routines. It's FREE advice. Why attack someone who is sharing their life style with you? If you don't like it, don't watch, simple.
I remember my first youtube channel as lov3sponge, everynow and again I'd get stupid hate comments but, overall ppl are overwhelmingly supportive and that's what caused me to even bother coming back. The hate is gonna be there no matter what..not everyone is gonna like you... but, if you can move past that and share your passion with ppl then it all becomes worth something.